Self-threading shuttle



Jan. 3, 1950 s, BRIGHT 2,493,568

SELF-THREADING SHUTTLE Filed June 3, 1947 gvwc/wto v STARl'lNG I. BRIGETUNITED Patented Jan. 3, 1950 SELF-THREADING SHUTTLE Starling I. Bright,Greer, S. C.

Application June 3, 1947, Serial No. 752,219

This invention relates to self-threading shuttles.

My invention is concerned with a self-threading shuttle of the samegeneral type as that dis-'- closed in United States patent to Davis1,573,227.

A specific object of my invention is to devise an improved constructionof side delivery eye for the shuttle.

Another object of my invention is to improve the threading block toprevent catching of the thread between the side flange of the block andthe wall of the block receivingchamber.

My invention will be explained in connection with the accompanyingdrawing in which A Figure 1 shows a shuttle construction of-the priorart, such as that shown in the Davis patent referred to above.

Figure 2 is a side elevational view of the'front end of a shuttleequipped with my improved side delivery eye.

Figure 3 is a plan view of Figure 2, a portion thereofbeing shown insection along a horizontal :plane passing through the center of the sidedelivery eye.

Figure 4 is a perspective view of the improved side delivery eye shownfrom a point to the rear and somewhat in front of the delivery eye.

Figure 1 shows the general type of shuttle on which my invention is animprovement. I indicates the shuttle body which is provided with abobbin chamber 2 in which is mounted the bobbin 3 in the usual manner.The front end of the body I is provided with a recess 4 having parallelside walls and forming .a chamber for receiving a threading block 5, theupper face of which is grooved to provide an open thread guiding grooveor passage. A thread casting and guiding element 6 is supported near therear end of the block and has the free end thereof positioned within theopen thread guiding passage of block 5. The block is also provided withthe usual thread directing apron 5b.

The shuttle body I is provided with a thread delivery slot located inthe front end of the threading block recess :4 and connecting thisrecess to one side of the shuttle. A delivery eye 1 is positioned withinthe delivery slot and comprises a metallic sleeve-like element having aslot in one side thereof as shown generally at 23 in the Davis Patent1,573,227. The outer end of the delivery eye opens into a thread guidinggroove 9 formed in the side of the shuttle body. After leaving theshuttle eye, the thread from the bobbin 3 is alternately drawn along thegroove 9 in one direction and then in the other. Eventu- 3 Claims. (01.139-223) ally, the thread causes excessive wear in the wooden surface ofthe groove 9 on both sides of the delivery eye, and this causes undueroughening of the thread guiding surface and eventually makes itnecessary to replace the shuttle. One object of my invention is toimprove the delivery eye construction to avoid this difficulty.

" My improved delivery eye construction is shown in Figures 2, 3 and 4,and involves a thread guide plate In seated in a recess formed in theside of the shuttle body and extending over a portion of the threadguiding groove 9 both to therear and front of the side delivery slot, as

more clearly shown in Figure 3. The rear end of the plate l0 extendsbeyond the cross-bolt 8 and is secured in position by means of thecrossbolt which passes through an aperture formed in the plate as shownin Figure 3. The forward end of plate I 0 is suitably secured to theshuttle body by suitable means such as the screw ll. Plate [0 is;provided with a slotted aperture in alignment withthe thread deliveryslot and carries onits be formed integrally by a casting operation. It

will also be understood that the two parts It] and [2 may be formedseparately and joined together in any suitable manner.

As shown in Figures 3 and 4, the plate In is curved in conformity withthe surface of the thread guiding groove 9, and the plate provides ametallic surface for the groove 9 over portions thereof extendingforwardly and rearwardly of the side delivery eye. This constructionprovides a smooth, hard wearing surface for the thread A coming from thebobbin 3, and thereby avoids the objectionable roughening of the surfaceof the groove as explained above.

In prior constructions according to Figure 1, there is a tendency forthe thread A from the bobbin 3 to catch at the point B between the sideflange 5a of the threading block 5 and the adjacent wall of the blockrecess 4. In order to overcome this objectionable feature, I extend theside flange of the threading block along the wall of the block recessand partly into the bobbin chamber 2 as shown at 5a in Figure 3. Thisconstruction places the corner or end of the flange 5a in a positionsuch that the thread cannot be caught between the corner or end of theflange and the shuttle body. 7

It will be understood that the cross-bolt 8 serves two functions; first,it serves the usual function of securing the threading block 6 in properposition in the recess for the block in the shuttle body, and secondly,it serves to clamp the rear end of the guide plate I0 to the shuttlebody. It will aisp be understood thatfth'e guide tube I? is joined tothe plate H3 in suEh-a nianfier that V the surfaces of these twoelements merge into each other in a smooth rounded surface, as show fiin Figure 3, in order to avoid undue friction against the thread.Iclaim: 1. In a self-threading shuttle haying a wooden body providedwith a recess in which Ts retired a threading block, and a threaddelivery slot con";

ma-1y; l row i-d siw h f eesss ncwhicliia ii a; threading b c sa d a read liv ry. 2* 99B: tne9t n a d re s A with th ea rew? rfqrmed in theisideu i c f s id, w qd n bedy s nrb qskf s e u ed, n. sai cr qe by a QRQ 'Phe imprqveni sa whi h o ist hi e d i fi sl te mm d-in. -r c s farm n es'g iaq pisaid ps l r 'exi'nd i fa i ar a said thread guiding groove bothto the -front of -2. Inla selr thr qin Shuttle having iawoodeh 4 and therear of said side delivery slot, said guide plate having a slottedaperture arranged in alignment with said delivery slot, the portion ofsaid guide plate forming the boundary of said slotted aperture beingextended into said delivery slot and providing a smoothly roundeddelivery eye, and the rear portion of said guide plate extending back tosaid cross-bolt and being clamped to said body 'bysaideros s-bolt. I I

3. Ina s'elf tl'freading shuttle having a wooden body provided with arecess in which is secured a threading block, and a thread delivery slotconnecting. said recess with a thread groove fbiiheh "the side surfaceof said wooden body, :and said :block is secured in said recess by acrossbo lt the improvement which consists in a thread eerie ime'ihcifinted in a recess formed in the side surface of said body andextending along and forming a portion of said thread guiding groo vebeth to the fror' tfof and the rear of said sm delivefy'slotfsaid gameate having asroaed aperture arranged in alignment withsaifd 'd'elivslot,and the fear semen of sets 'uidefpiate "51 mg bana samterse egre 39 017,. v

STARLING r. BRIGHT.

REFERENCES orrrif) V ITh e following references are of record in thefile of this patent: 7 a

sem s j N b r; V r Name' V Da FOREIGN PATENTS Number 7 Country Date 7405,404 a Great Britain 1.". *Feb. -8, 1934 Great Britain Jan. '15,-1-94 1

